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Finding the Fourth Proportional to 12,336.80, 18,505.20 and 11,213.60

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Solution

The fourth proportional to 12,336.80, 18,505.20 and 11,213.60 is: 16,820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,336.80 : 18,505.20 = 11,213.60 : x
  2. Step 2: Convert to fraction form
    12,336.80/18,505.20 = 11,213.60/x
  3. Step 3: Cross multiply
    12,336.80x = 18,505.20 × 11,213.60
  4. Step 4: Simplify right side
    12,336.80x = 207,509,910.72
  5. Step 5: Solve for x
    x = 207,509,910.72/12,336.80
  6. Step 6: Final answer
    x = 16,820.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.